P341/EN O/B11
Operation Guide
CHAPTER 4
Problem Analysis
Page 4/8
MiCOM P341
3.
POWER UP ERRORS
If the relay does not appear to power up then the following procedure can be used to
determine whether the fault is in the external wiring, auxiliary fuse, power supply
module of the relay or the relay front panel.
Test
Check
Action
1
Measure auxiliary voltage on
terminals 1 and 2, verify voltage
level and polarity against the rating
label on front.
Terminal 1 is -dc, 2 is +dc
If auxiliary voltage is present and
correct, then proceed to test 2.
Otherwise the wiring/fuses in
auxiliary supply should be checked.
2
Do LEDs/ and LCD backlight
illuminate on power up, also check
the N/O watchdog contact for
closing.
If they illuminate or the contact
closes and no error code is
displayed then error is probably in
the main processor board (front
panel). If they do not illuminate
and the contact does not close then
proceed to test 3.
3
Check Field voltage output
(nominally 48V DC)
If field voltage is not present then
the fault is probably in the relay
power supply module. Consult
Chapter 3 for a description of how
to remove this module. The part
number of this module can be
checked to verify that the rating of
the module conforms to the
auxiliary rated printed on the relay
front panel.
Table 2:
Failure of relay to power up
4.
ERROR MESSAGE/CODE ON POWER-UP
During the power-up sequence of the relay self-testing is performed as indicated by
the messages displayed on the LCD. If an error is detected by the relay during these
self-tests then an error message will be displayed and the power-up sequence will be
halted. If the error occurs when the relay application software is executing then a
maintenance record will be created and the relay will re-boot.
Test
Check
Action
1
Is an error message or code
permanently displayed during
power up.
If relay locks up and displays an
error code permanently then
proceed to test 2. If the relay
prompts for input by the user
proceed to test 4. If the relay re-
boots automatically then proceed to
test 5
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Страница 145: ...Operation Guide P341 EN O B11 MiCOM P341 APPENDIX A Relay Menu Database...
Страница 273: ...Operation Guide P341 EN O B11 MiCOM P341 APPENDIX B External Connection Diagrams...
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